PIASKOWCE DOLNEGO KARBONU STREFY WIELKOPOLSKO-ŚLĄSKIEJ JAKO UTWORY PERSPEKTYWICZNE POD WZGLĘDEM POSZUKIWAŃ ZŁÓŻ GAZU ZAMKNIĘTEGO (BADANIA WSTĘPNE)

Abstract

THE LOWER CARBONIFEROUS SANDSTONES IN THE WIELKOPOLSKA-SILESIA ZONE PROSPECTIVE FOR TIGHT GAS EXPLORATION (PRELIMINARY STUDIES)Abstract. The Lower Carboniferous sandstones of the Wielkopolska-Silesia zone are represented mainly by sublithic, lithic and subarkosic wackes and less frequent arenites. They are characterized by total porosity of mostly 1–2% and very low permeability. The effects of diagenetic processes such as compaction, cementation, replacement, alteration and dissolution have been distinguished in the investigated rocks. The most prospective tight gas sandstones occur in the south and south-western parts of the Wielkopolska-Silesia zone. The top of the Lower Carboniferous rocks does not exceed a depth of 3 km in these regions.